we have been using odoo 8.0 so far. Odoo 8 had this very useful feature to view the chart of accounts as hierachical tree including all booked amuonts and amount aggregations. I cannot find this feature in odoo 9.0 anymore. If I view the chart of account i get a flat list of all acounts which I can group by type. This is not quite helpful since the account hierachy is a major part of the accounting concept. I am currently evaluating the odoo 9.0 community edition.

Any hints how to get this view in odoo 9? It seems to be possible as on thei picture

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The concept of hierarchical CoA has been abandoned in 9.0 and replaced by using tags. The picture you've provided shows a report with drilldown feature. I can't point you to it, because I do not have the Enterprise Edition. Please check the user documentation for more help about accounting: https://www.odoo.com/documentation/user/9.0/accounting.html